magento/magento2#38892: Email template store-switcher

[lucafuser]

Description (*)

jQuery load method is deprecated, see https://bugs.jquery.com/ticket/11733/
We need to use .on("load", callback)

Related Pull Requests

Fixed Issues (if relevant)

1. Fixes Email template store-switcher #38892

Manual testing scenarios (*)

1. Open an email template preview (newsletter module)
2. Try to open the store switcher

Questions or comments

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• README.md files for modified modules are updated and included in the pull request if any README.md predefined sections require an update
• All automated tests passed successfully (all builds are green)

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[lucafuser]

@magento run all tests